I mostly promote Japanese which is probably the absolute worst niche to promote considering the ridiculous piracy and the fact that you're trying to sell censored porn.
In spite of all that, I make a pretty consistent bit of money every month and makes sales every day. and this is on top of the fact that the economy is in the shitter.
I'd take a wild guess that a lot of people's crap sales are due in large part to all of the slopped-together, no effort sites and spam blogs that a lot of webmasters these days have.
edit: also, Gay porn is as solid as ever. Gay guys have money, that's a true stereotype.
